The power conversion efficiency (PCE) of perovskite solar cells has improved quickly in the past few years, but the PCE is still much lower than the theoretical limit. The relatively high energy loss () is one of the critical factors limiting the PCE. To resolve the above issues, a synergistic modification strategy was used herein to minimize . RbCl and potassium polyacrylate (K-PAM) were used to modify the SnO layer. Additionally, Pb(Ac) was introduced into PbI to further improve the film quality. The synergistic modification strategy reduced the defects in SnO and perovskite and improved the energy-level alignment, enabling significantly reduced and enhanced photovoltaic performance. The best PCE of 24.07% was achieved, which was much higher than that of the control device (20.86%). The was only 0.349 eV for the target device. Good stability was achieved for the cells made using modified SnO and perovskite layers.
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